High-strength plain carbon steels having improved formability
USRE28791E · kind E · reissue
Assignee
Inventors
Key dates
| Filing date | Nov 11, 1974 |
| Grant date | Apr 27, 1976 |
| Priority date | — |
| Expiry date | Nov 11, 1994 |
Classification
- Technology area (CPC —)General
Abstract
Fully killed high-strength plain carbon steels consisting essentially of 0.06% to .20% carbon, .4% to 1.2% manganese, .005% to .3% silicon, .04% maximum sulfur, .04% maximum phosphorus, an inclusion shape control agent comprising .05% to .20% zirconium, or .01% to .10% of rare earths or .01% to .10% mischmetal, balance iron are characterized in a hot-rolled finished condition by a yield strength in excess of 35,000 p.s.i., an ultimate tensile strength in excess of 55,000 p.s.i., ductility as measured by percent elongation (2 inches) in excess of 30%, good toughness and superior formability. The steels are hot-rolled finished in the temperature range 1550.degree. F. to 1650.degree. F., cooled at a rate within the temperature range 20.degree. F. to 135.degree. F. per second and collected by coiling or piling within a temperature range of 900.degree. F. to 1200.degree. F., preferably between 1025.degree. F. to 1175.degree. F.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.